99900998 has 8 divisors (see below), whose sum is σ = 155018880. Its totient is φ = 48228040.

The previous prime is 99900971. The next prime is 99901001. The reversal of 99900998 is 89900999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861158 + ... + 861273.

It is an arithmetic number, because the mean of its divisors is an integer number (19377360).

Almost surely, 2^99900998 is an apocalyptic number.

99900998 is a deficient number, since it is larger than the sum of its proper divisors (55117882).

99900998 is a wasteful number, since it uses less digits than its factorization.

99900998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722462.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 99900998 is about 9995.0486742187. The cubic root of 99900998 is about 464.0056572586.

Subtracting from 99900998 its reverse (89900999), we obtain a palindrome (9999999).

The spelling of 99900998 in words is "ninety-nine million, nine hundred thousand, nine hundred ninety-eight".